Move some class-scope constants to file-scope in the lone subclass using them.

ui/views/layout/layout_constants.h

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef UI_VIEWS_LAYOUT_LAYOUT_CONSTANTS_H_
 #define UI_VIEWS_LAYOUT_LAYOUT_CONSTANTS_H_
 
 #include "build/build_config.h"
 #include "ui/views/layout/grid_layout.h"
 
 // This file contains some constants we use to implement our standard panel
 // layout.
 // see: spec 21/4
 
 namespace views {
 
 // Left or right margin.
-const int kPanelHorizMargin = 13;
+constexpr int kPanelHorizMargin = 13;
 
 // Top or bottom margin.
-const int kPanelVertMargin = 13;
+constexpr int kPanelVertMargin = 13;
 
 // When several controls are aligned vertically, the baseline should be spaced
 // by the following number of pixels.
-const int kPanelVerticalSpacing = 32;
+constexpr int kPanelVerticalSpacing = 32;
 
 // Vertical spacing between sub UI.
-const int kPanelSubVerticalSpacing = 24;
+constexpr int kPanelSubVerticalSpacing = 24;
 
 // Vertical spacing between a label and some control.
-const int kLabelToControlVerticalSpacing = 8;
+constexpr int kLabelToControlVerticalSpacing = 8;
 
 // Small horizontal spacing between controls that are logically related.
-const int kRelatedControlSmallHorizontalSpacing = 8;
+constexpr int kRelatedControlSmallHorizontalSpacing = 8;
 
 // Horizontal spacing between controls that are logically related.
-const int kRelatedControlHorizontalSpacing = 8;
+constexpr int kRelatedControlHorizontalSpacing = 8;
 
 // Vertical spacing between controls that are logically related.
-const int kRelatedControlVerticalSpacing = 8;
+constexpr int kRelatedControlVerticalSpacing = 8;
 
 // Small vertical spacing between controls that are logically related.
-const int kRelatedControlSmallVerticalSpacing = 4;
+constexpr int kRelatedControlSmallVerticalSpacing = 4;
 
 // Horizontal spacing between controls that are logically unrelated.
-const int kUnrelatedControlHorizontalSpacing = 12;
+constexpr int kUnrelatedControlHorizontalSpacing = 12;
 
 // Larger horizontal spacing between unrelated controls.
-const int kUnrelatedControlLargeHorizontalSpacing = 20;
+constexpr int kUnrelatedControlLargeHorizontalSpacing = 20;
 
 // Vertical spacing between controls that are logically unrelated.
-const int kUnrelatedControlVerticalSpacing = 20;
+constexpr int kUnrelatedControlVerticalSpacing = 20;
 
 // Larger vertical spacing between unrelated controls.
-const int kUnrelatedControlLargeVerticalSpacing = 30;
+constexpr int kUnrelatedControlLargeVerticalSpacing = 30;
 
 // Vertical spacing between the edge of the window and the
 // top or bottom of a button.
-const int kButtonVEdgeMargin = 9;
+constexpr int kButtonVEdgeMargin = 9;
 
 // Horizontal spacing between the edge of the window and the
 // left or right of a button.
-const int kButtonHEdgeMargin = 13;
+constexpr int kButtonHEdgeMargin = 13;
 
 // Vertical spacing between the edge of the window and the
 // top or bottom of a button (when using new style dialogs).
-const int kButtonVEdgeMarginNew = 20;
+constexpr int kButtonVEdgeMarginNew = 20;
 
 // Horizontal spacing between the edge of the window and the
 // left or right of a button (when using new style dialogs).
-const int kButtonHEdgeMarginNew = 20;
+constexpr int kButtonHEdgeMarginNew = 20;
 
 // Horizontal spacing between buttons that are logically related.
-const int kRelatedButtonHSpacing = 6;
+constexpr int kRelatedButtonHSpacing = 6;
 
 // Indent of checkboxes relative to related text.
-const int kCheckboxIndent = 10;
+constexpr int kCheckboxIndent = 10;
 
 // Horizontal spacing between the end of an item (i.e. an icon or a checkbox)
 // and the start of its corresponding text.
-const int kItemLabelSpacing = 10;
+constexpr int kItemLabelSpacing = 10;
 
 }  // namespace views
 
 #endif  // UI_VIEWS_LAYOUT_LAYOUT_CONSTANTS_H_